Those are likely the codes for the two free ebooks for Mother's day. They are 'Already Home' by Susan Mallery (alreadypc) and 'The Goodbye Quilt' by Susan Wiggs (goodbyepc). I am not going to try these out to see if they work as I don't want my recommendations to get messed up. . .
But here are the directions if you're interested:
http://www.kobobooks.com/mothersday